Measurement of the top quark pair production cross section with 1.12 $$fb^{-1}$$ of $$p\overline{p}$$ collisions at $$\sqrt{s}$$ = 1.96 TeV
- Harvard Univ., Cambridge, MA (United States)
We present a measurement of the top quark pair production cross section in e+jets and µ+jets events recorded with the CDF II detector. The data correspond to 1.12 fb-1 of pp collisions with center-of-mass energy 1.96 TeV taken during Run 2 of the Fermilab Tevatron. We identify tt candidate events by requiring at least one secondary vertex b-tag, and we measure a production cross section of 8.2 ±0.5 (stat) ±0.8 (syst) ±0.5 (lum) pb, the most precise single measurement of σtt to date. As a check, we also measure σtt in events with multiple b-tagged jets using a higher-efficiency tagging algorithm, and there we measure 8.8 +0.8 -0.7 (stat) ±1.2 (syst) ±0.5 (lum) pb, also the most precise single measurement with this signature. Both results assume a top quark mass of 175 GeV/c 2 , for which the theoretical expectation is 6.7 +0.7 -0.9 pb; the measured excess is of the order 1σ, and becomes less significant at the current world average top mass of 171 GeV/c 2 .
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1415816
- Report Number(s):
- FERMILAB-THESIS-2007-82; AAT-3285547; PROQUEST-1421625931; 776426
- Country of Publication:
- United States
- Language:
- English
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